What the letters usually mean
GIA describes A jade as natural jadeite or material polished with wax only; B jade as acid-bleached and polymer-impregnated; C jade as dyed. B+C describes combined impregnation and dyeing. Wording can differ among laboratories and jurisdictions.
What they do not mean
The letters do not grade color, transparency, workmanship or beauty. Untreated material can be ordinary in appearance; treated material can look attractive. Treatment disclosure and quality assessment are separate questions.
Read the actual report
Prefer the laboratory’s explicit conclusion and treatment comments over a seller’s shorthand. Note species, item description, measurements and whether the document can be verified with the issuing laboratory.
Trade letters need a sentence beside them
A, B, C and B+C are useful only when the treatment wording is stated in full. They are not a universal beauty scale, and reports may use different regional language. Read the conclusion and comments rather than stopping at one letter.
A treatment vocabulary, not a quality ladder
The familiar letters answer a narrow question: what treatment category is being communicated? They do not rank beauty, rarity, workmanship or price. Type A can describe modest material, while an attractive appearance does not prove an untreated state. Keep treatment disclosure separate from the visual assessment set out in evaluating jadeite.
GIA literature commonly uses A for natural jadeite or jadeite with traditional surface waxing, B for material bleached with acid and impregnated with polymer, C for dyed material, and B+C for both impregnation and dye. These are trade conventions rather than a single statutory grading system used identically everywhere.
Why bleaching and impregnation are paired
Acid bleaching can remove or reduce discolored material along accessible structures, but it may leave a weakened or porous network. Polymer impregnation fills that network and can improve apparent transparency and stability. The resulting appearance is not reliable evidence of the treatment: laboratory work may use microscopy, spectroscopy and other analytical observations.
“Bleached” on its own is incomplete wording. Clarify whether a report found polymer impregnation, dye, surface treatment, or no indications of the treatments it tested for. A laboratory conclusion has a defined scope; it should not be expanded beyond its actual text.
Dye and color observation
Dye may be introduced to alter or intensify color. Concentration along fractures or boundaries can be a reason for further examination, but no single visual pattern proves dye. Natural color distribution can also be uneven, and photographs change with exposure, white balance and display processing.
Use neutral-light observation to describe hue, tone, saturation and distribution, then leave identification to appropriate testing. The limits of the photograph are explained in the lighting guide.
How to read a seller description
| Wording | Question to ask |
|---|---|
| Type A | Which laboratory wording supports it, and does it mention wax? |
| Type B | Does the report explicitly identify polymer impregnation? |
| Type C | Does the report explicitly identify dye? |
| Natural jade | Does “jade” mean jadeite or nephrite, and what treatment tests were made? |
Read the item description, measurements, conclusion, comments, report number and verification channel together. The practical sequence appears in reading a jadeite laboratory report.
Research basis
- Identification of Bleached and Polymer-Impregnated Jadeite — GIA Gems & Gemology
- Dyed polymer-impregnated jadeite jade — The Journal of Gemmology / Gem-A
- Jade Description — GIA